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Old 11th October 2012, 03:16 PM   #7531
pdul is offline pdul  Denmark
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I am going to divide my cabinet into two sections, one for transformers/powersupply, and one for the rest of the preamp. Which material is the better one to make the shielding between the two sections, copper or aluminum?
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Old 11th October 2012, 03:22 PM   #7532
Salas is offline Salas  Greece
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Copper.
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Old 11th October 2012, 04:02 PM   #7533
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We made PCBs for the preamp and the power buffer. It did not catch on much.
I have to search for the schematics.
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File Type: jpg Power Buffer and High Speed Pramp PCB.jpg (407.3 KB, 227 views)
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Old 11th October 2012, 04:04 PM   #7534
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Quote:
Originally Posted by pdul View Post
I am going to divide my cabinet into two sections, one for transformers/powersupply, and one for the rest of the preamp. Which material is the better one to make the shielding between the two sections, copper or aluminum?
Copper as well but why not 2 separate enclosures?

Got same Stainless Steel (non magnetic) in My Paradise tread.

I will use copper lining on the Phono as well.

Mu Metal is out of my price range at present, still Paradise work realy well witout to much fussing about...
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Old 11th October 2012, 04:20 PM   #7535
pdul is offline pdul  Denmark
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Copper as well but why not 2 separate enclosures?
I already have a nice and expensive cabinet from Italy, which i bought some time ago, for a preamp project, and the paradise came as sent from heaven since the phono section, was the only link missing, to make it complete. I have the linestages, the input selector, and a relay volumecontrol. My aim is to make a good preamp in one box
The pics is from when i tested the line pcbs.
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File Type: jpg CIMG0034.jpg (996.7 KB, 223 views)
File Type: jpg CIMG0035.jpg (836.3 KB, 201 views)
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File Type: pdf Airline_1_SCH.pdf (31.1 KB, 92 views)
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Old 11th October 2012, 04:26 PM   #7536
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Nice preamp circuit. I like it.
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Old 11th October 2012, 04:32 PM   #7537
pdul is offline pdul  Denmark
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It works well too
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Old 11th October 2012, 05:17 PM   #7538
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Who designed it ?
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Old 11th October 2012, 05:27 PM   #7539
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Some new information :
In an open loop phono like the Paradise it can happen that the channels have a slight mismatch in gain, say 1dB. That can be corrected by using slightly lower value emitter resistors on the softer channel.
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Old 11th October 2012, 06:12 PM   #7540
pdul is offline pdul  Denmark
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Who designed it ?
Originally Lars Clausen. It was part of a Danish diy project in The High Fidelity magazine back in 91-92. Later i took it out of the preamp project and altered the components into something available, and Dimitri tuned it a little and made a nice pcb layout
Pictures of the original project and Dimitris pcb layout.
Attached Images
File Type: jpg HPIM0447.jpg (91.3 KB, 184 views)
File Type: gif air-line-temp.GIF (48.0 KB, 174 views)
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